LXR linux/fs/erofs/xattr.h

   1/* SPDX-License-Identifier: GPL-2.0-only */
   2/*
   3 * Copyright (C) 2017-2018 HUAWEI, Inc.
   4 *             https://www.huawei.com/
   5 */
   6#ifndef __EROFS_XATTR_H
   7#define __EROFS_XATTR_H
   8
   9#include "internal.h"
  10#include <linux/posix_acl_xattr.h>
  11#include <linux/xattr.h>
  12
  13/* Attribute not found */
  14#define ENOATTR         ENODATA
  15
  16static inline unsigned int inlinexattr_header_size(struct inode *inode)
  17{
  18        return sizeof(struct erofs_xattr_ibody_header) +
  19                sizeof(u32) * EROFS_I(inode)->xattr_shared_count;
  20}
  21
  22static inline erofs_blk_t xattrblock_addr(struct erofs_sb_info *sbi,
  23                                          unsigned int xattr_id)
  24{
  25#ifdef CONFIG_EROFS_FS_XATTR
  26        return sbi->xattr_blkaddr +
  27                xattr_id * sizeof(__u32) / EROFS_BLKSIZ;
  28#else
  29        return 0;
  30#endif
  31}
  32
  33static inline unsigned int xattrblock_offset(struct erofs_sb_info *sbi,
  34                                             unsigned int xattr_id)
  35{
  36        return (xattr_id * sizeof(__u32)) % EROFS_BLKSIZ;
  37}
  38
  39#ifdef CONFIG_EROFS_FS_XATTR
  40extern const struct xattr_handler erofs_xattr_user_handler;
  41extern const struct xattr_handler erofs_xattr_trusted_handler;
  42#ifdef CONFIG_EROFS_FS_SECURITY
  43extern const struct xattr_handler erofs_xattr_security_handler;
  44#endif
  45
  46static inline const struct xattr_handler *erofs_xattr_handler(unsigned int idx)
  47{
  48        static const struct xattr_handler *xattr_handler_map[] = {
  49                [EROFS_XATTR_INDEX_USER] = &erofs_xattr_user_handler,
  50#ifdef CONFIG_EROFS_FS_POSIX_ACL
  51                [EROFS_XATTR_INDEX_POSIX_ACL_ACCESS] =
  52                        &posix_acl_access_xattr_handler,
  53                [EROFS_XATTR_INDEX_POSIX_ACL_DEFAULT] =
  54                        &posix_acl_default_xattr_handler,
  55#endif
  56                [EROFS_XATTR_INDEX_TRUSTED] = &erofs_xattr_trusted_handler,
  57#ifdef CONFIG_EROFS_FS_SECURITY
  58                [EROFS_XATTR_INDEX_SECURITY] = &erofs_xattr_security_handler,
  59#endif
  60        };
  61
  62        return idx && idx < ARRAY_SIZE(xattr_handler_map) ?
  63                xattr_handler_map[idx] : NULL;
  64}
  65
  66extern const struct xattr_handler *erofs_xattr_handlers[];
  67
  68int erofs_getxattr(struct inode *, int, const char *, void *, size_t);
  69ssize_t erofs_listxattr(struct dentry *, char *, size_t);
  70#else
  71static inline int erofs_getxattr(struct inode *inode, int index,
  72                                 const char *name, void *buffer,
  73                                 size_t buffer_size)
  74{
  75        return -EOPNOTSUPP;
  76}
  77
  78#define erofs_listxattr (NULL)
  79#define erofs_xattr_handlers (NULL)
  80#endif  /* !CONFIG_EROFS_FS_XATTR */
  81
  82#ifdef CONFIG_EROFS_FS_POSIX_ACL
  83struct posix_acl *erofs_get_acl(struct inode *inode, int type, bool rcu);
  84#else
  85#define erofs_get_acl   (NULL)
  86#endif
  87
  88#endif
  89
  90